All you guys buying these 930's and 940's have me very jealous. I'm going to have to get one, but for right now, I don't have one and can't answer your question. But, some of the other guys may be able to chime in and help though if we knew if the gun isn't ejecting well. Feeding well. Stovepipes, etc.
It's generally the lighter loads that are more troublesome because they have less powder/pressure to cycle the bolt and softer cyling.